Riveting machine



H. ELSNER RIVETING MACHINE Filed Aug. 26, 1929 .osition of the rivets.

latented May I7, 1932 uneven STATES PATENT QFFHE RIVETING- MACHJ. N J1! pplication filed August 26, 1929, Serial No. 388,487, and in GcrmanyMay 41, 1929.

The present invention relates to av riveting machine adapted to handle solid, hollow, and two-pointed rivets.

.1 here are riveting machines known, in which the rivets, prior to the descent of the upper. tool, are held by the latter so that their shanks project a certain distance from the tool for the purpose of engaging the job to be worked and to insure an accurate central To bring about this engagement, the job has to be lifted and to cooperate in the descent of the upper tool, which is quite troublesome especially where large and heavy jobs are conc rned. Attempts have been made to overcome this drowhack by providing in the lower tool a cushioned pin serving as guide for placing the job on the lower tool and for putting over the pierced workpiece, the pin forming a part of the dolly during the actual riveting process.

The present invention constitutes an improvement of this type of machine by substitilting for the cushioned pin in the lower tool the rivet itself, and the rivets are fed to the lower tool directly so that their shanks point upwardly. the feeding taking place by a device arrying out on up and down movement. The iower tool is provided with spring-ectoated holdin -t, jaws which are spread apart by the descending" feeding device to admit the rivets to the lower tool. During the ascent of the feeding device the jaws are pressed together and engage the upwardly pointing shank of the inserted rivet. It is possible either to move the entire feeding device up and down or to subdivide it so that only the front part has rise and fall.

The part moving up and down is fitted with a locking device adapted to release only one rivet at each descent of the feeding device. Simultaneously, according to the invention, the ascending and descending part of the latter is specially constructed to enable the rivets to move from their original position in the feeding device into the required posi 'tion in the lower tool, the feeding device having a conduit at the admission end by which the rivets are caused to turn from a osition wherein their shafts point downwar ly into a position wherein their heads are in front. T hey slide down in this conduit in the said position with their heads always to the front, leave the feeding device with their heads first, and finally enter the lower tool in a position representing a turn of 180 relative to their original position.

The up and down movement of the feed ing device or its front part may he either independent of the motion of the upper tool, moving also up and down. The movement of the feeding device is caused by a special drive, or by motion depending on that of the up or tool and employing cams and the like.

She embodiment of the invention is illustrated in the accompanying drawings, in which Figure l is a side View of the lower and upper tool with. the feeding device; Fig. 2, a front view of the same parts; Fig. 3, a side view of the lower end of the feeding device in its uppermost position; Fig. 4, a side View of the feeding device with thelower end in lowermost position; Figs. and 6 are, respectively, sections on the lines AB and O-D of Fig. 3; and Fig. 7 is a. front view of Fig. 4.. i p I Referring to the drawings, 1 is a machine arm within which the upper tool i. e. the upper set 2, carries out an n and down movement. 3 is a second machine arm receiving firmly the lower tool 4 on which the guide piece 5 is slidingly arrangedand subjected to the action of the compression springs. 6. Attached to the guide piece are rotatable jaws 7 drawn together by the spring 8. To the upper tool 2 the up and down motion is imparted in the known manner by a crank drive 9 arranged on the driving shaft 10 and connected by the levers 11 and 12 with the rod 13 of the upper tool. 14 is the drum for the rivets which in the known manner move from the drum into the feeding device 15 provided with the conduit 16. 17 is the covering rail for the conduit 16. 18 are the rivets.

In the modification shown only the front part 15a of the feeding device moves up and down, and the feeding device 15 is provided with a locking mechanism 19 of known type to release one rivetat a time. The moving part 15a may be driven by a special lever ar- 24. Attached to the free end of the latter is.

a bar 25 which engages the ascending and descending part a to impart to the atter an up and down motion every timethe upper tool ascends. On the other hand, if the lat ter descends, the part 15a of the feeding device remains in its uppermost position. The part 15a of the feeding device is fitted at its foremost lower end with a wedge surface 26 which during the descent of the dea vizil vice moves between the cushioned jaws 7 and spreads them apart so that the rivet may enterthe lower tool. The part 15a is further provided with a specially constructed conduit 27;" Therivcts slide out of the conduit 16 with their shanks pointing downwardly and, when they enter the conduit 27, are turned sothat their heads are in front (Fig. 3) The rivets then siide with their heads in frontdown through-the conduit 21' until their heads enterthe lewer tool (Fig. 4;). On the eturn cf the" feeding device 15a the jaws 1x; the action of the spring 8, are sight-en the rivet and retain it in iheiower tee}. with the shank up. w

I The job to be worked can now beplaced its hoies ever the npwardiy projecting shank ofthe rivet and the iower tool, and the i is equipped with a special io'c pg device :28 which releases only one riv'et 18 at timer For this purpose the de- 3 we 28 s arranged on the bolt 29 operated I uide pieceSO rigidly secured to e arm 1.

1. A riveting machine comprising in combination lower tool, subdivided feeding device for guiding a rivet to the said lower tool and having a front part adapted to move up'and down, and a locking mechanism at tached to the said front part and adapted to release only one rivet at a time from. a column of rivets in the feeding device.

2. A riveting machine comprising in combination an upper and a iower tool, the upper tool carrying out an up and down movement, a feeding device adapted to move up and down and to feed rivets direct to the said lower tool. and spring-actuated attached to the said lower tool'and adapted to be opened by the said feeding device during the iat-ters descent caused by the upper tool and to hold the said rivets by their upwardly projecting shanks,

oi can form the head above the job 2 it I 1,859,081

3. A riveting machine comprising in combination a lower tool, a subdivided feeding device for guiding rivets direct to the said lower tool and having a part adapted to move up and down, and a conduit provided in the said'imovin part,-the rivets turning at the ad-' mission en vof the said conduit from a posi tion wherein their shafts point downwardly into a position wherein their heads are in front.

4. A riveting maehine'comprising in combination an upper and a lower tool, the upper tool carrying out an up and down movement,

an ascending and descending feeding device from which rivets are discharged with their heads first and enter the said lower tool in a position altered to a predetermined degree relative to their original position, and springactuated holding jaws adapted to straighten and fix the said rivets during the ascent of the said feeding device.

5. A riveting machine comprising 1n comhination a movable upper tool and a lower,

nature.

HEINRICH ELSNER. 

